Remove Sparse Histograms from Blink Platform API.

third_party/WebKit/Source/core/dom/ViewportDescription.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2012-2013 Intel Corporation. All rights reserved.
  *
@@ skipping 14 matching lines @@
  *
  */
 
 #include "core/dom/ViewportDescription.h"
 
 #include "core/dom/Document.h"
 #include "core/frame/FrameHost.h"
 #include "core/frame/FrameView.h"
 #include "core/frame/LocalFrame.h"
 #include "core/frame/Settings.h"
+#include "platform/Histogram.h"
 #include "platform/weborigin/KURL.h"
 #include "public/platform/Platform.h"
 
 namespace blink {
 
 static const float& compareIgnoringAuto(const float& value1, const float& value2, const float& (*compare) (const float&, const float&))
 {
     if (value1 == ViewportDescription::ValueAuto)
         return value2;
 
@@ skipping 187 matching lines @@
     if (isMetaViewportType()) {
         if (maxWidth.type() == blink::Fixed) {
             Platform::current()->histogramEnumeration("Viewport.MetaTagType", ConstantWidth, TypeCount);
 
             if (mainFrame->view()) {
                 // To get an idea of how "far" the viewport is from the device's ideal width, we
                 // report the zoom level that we'd need to be at for the entire page to be visible.
                 int viewportWidth = maxWidth.intValue();
                 int windowWidth = mainFrame->host()->visualViewport().size().width();
                 int overviewZoomPercent = 100 * windowWidth / static_cast<float>(viewportWidth);
-                Platform::current()->histogramSparse("Viewport.OverviewZoom", overviewZoomPercent);
+                DEFINE_STATIC_LOCAL(SparseHistogram, overviewZoomHistogram, ("Viewport.OverviewZoom"));
+                overviewZoomHistogram.sample(overviewZoomPercent);
             }
 
         } else if (maxWidth.type() == blink::DeviceWidth || maxWidth.type() == blink::ExtendToZoom) {
             Platform::current()->histogramEnumeration("Viewport.MetaTagType", DeviceWidth, TypeCount);
         } else {
             // Overflow bucket for cases we may be unaware of.
             Platform::current()->histogramEnumeration("Viewport.MetaTagType", MetaWidthOther, TypeCount);
         }
     } else if (type == ViewportDescription::HandheldFriendlyMeta) {
         Platform::current()->histogramEnumeration("Viewport.MetaTagType", MetaHandheldFriendly, TypeCount);
     } else if (type == ViewportDescription::MobileOptimizedMeta) {
         Platform::current()->histogramEnumeration("Viewport.MetaTagType", MobileOptimizedMeta, TypeCount);
     }
 #endif
 }
 
 bool ViewportDescription::matchesHeuristicsForGpuRasterization() const
 {
     return maxWidth == Length(DeviceWidth)
         && minZoom == 1.0
         && minZoomIsExplicit;
 }
 
 } // namespace blink